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  <text>From the command prompt:
cleartool man

This invokes an html file showing the command overview for cleartool.

Also,
cleartool man find
Will show you the man page just for "find".

I think the clearcase report builder uses perl scripts based on command line apps to achieve their results, so that's another good place to look for command line documentation.  See this one as an example:
C:/clearcase/reports/scripts/Elements/Checkins_Since_Date_by_User.prl

Fun, fun, fun!

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  <last_update>2007-10-04T00:52:20.5790806Z</last_update>
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  <comments>
    <comment>
      <id>bfc35003-dd6e-422d-83bd-fc98fdfd275f</id>
      <title />
      <date>2004-11-23T13:11:47</date>
      <author>Mike</author>
      <email />
      <text>The words fun and clearcase just don't seem to go together...</text>
    </comment>
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